Someone tried this move on me today:
I'm the one in blue, thankfully the line continued going.
I'm not sure if it's this spidey sense that you develop when you've been riding in traffic for a while, but I had spotted something weird about this van when I was some way behind it. Was going along side and straight when I saw him wiggle out, then just pull left while I was alongside.
It all had that slightly 'bullet time ballet' as I cycled round the front of the van at touching distance then somehow came to a stop alongside the drivers side window. The driver had the cheek to give me an annoyed look.